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Application of a Triple-Conducting Heterostructure Electrolyte of Ba<sub>0.5</sub>Sr<sub>0.5</sub>Co<sub>0.1</sub>Fe<sub>0.7</sub>Zr<sub>0.1</sub>Y<sub>0.1</sub>O<sub>3-δ</sub> and Ca<sub>0.04</sub>Ce<sub>0.80</sub>Sm<sub>0.16</sub>O<sub>2-δ</sub> in a High-Performance Low-Temperature Solid Oxide Fuel Cell.

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Advanced Fuel Cell Based on Perovskite La-SrTiO

Gang Chen, Bin Zhu1,2, Hui Deng1

  • 1Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, Key Laboratory of Ferro & Piezoelectric Materials and Devices of Hubei Province, Faculty of Physics and Electronic Science , Hubei University , Wuhan 430062 , Hubei , China.

ACS Applied Materials & Interfaces
|September 11, 2018
PubMed
Summary

Researchers developed a novel La0.25Sr0.75TiO3 (LST) electrolyte for solid oxide fuel cells. This material achieves high power density at low temperatures due to surface superionic conduction.

Keywords:
La-substituted SrTiO3core−shell heterostructureoxygen vacanciessolid oxide fuel cellsuperionic conduction

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Conversion

Background:

  • Solid oxide fuel cell (SOFC) performance is critically dependent on the ionic conductivity of the electrolyte material.
  • Traditional electrolytes often require high operating temperatures, increasing costs and limiting applications.
  • Developing novel electrolytes with enhanced ionic transport at lower temperatures is crucial for SOFC advancement.

Purpose of the Study:

  • To investigate the potential of the perovskite semiconductor La0.25Sr0.75TiO3 (LST) as an electrolyte in solid oxide fuel cells.
  • To explore the mechanism of surface superionic conduction in LST for improved oxygen ion transport.
  • To evaluate the power density and conductivity performance of LST-based electrolytes at reduced operating temperatures.

Main Methods:

  • Synthesis of La0.25Sr0.75TiO3 (LST) perovskite materials.
  • Fabrication of a heterostructure electrolyte with an insulating core and a superionic conducting surface layer.
  • Characterization of ionic conductivity and phase transitions under fuel cell operating conditions.
  • Performance testing of SOFCs utilizing the LST electrolyte at 550 °C.

Main Results:

  • The prepared LST materials exhibited a heterostructure comprising an insulating core and a superionic conducting surface layer.
  • Rapid oxygen ion conduction was primarily attributed to transport along surfaces and grain boundaries.
  • A fuel cell-induced phase transition in LST led to a super oxygen ion conductivity of 0.221 S cm-1 at 550 °C.
  • The LST electrolyte demonstrated a superior power density of 908.2 mW cm-2 at 550 °C.

Conclusions:

  • La0.25Sr0.75TiO3 (LST) can function as an effective electrolyte in solid oxide fuel cells by leveraging surface superionic conduction.
  • The heterostructure design and fuel cell-induced phase transition are key to achieving high ionic conductivity and power output at 550 °C.
  • This novel approach offers a promising pathway for developing high-performance, lower-temperature SOFCs.